Dressing device for abrasive wheels



June 24, 1930.

J. MAICKEL 1,766,029

DRESSING DEVICE FOR ABRASIVE WHEELS Filed Nov. 22. 1926 2 Sheets-Sheet '1 w I 'rl1= gnwfltu M j Patented June 2 4, 1930 PAT-ENTIT OFFICE JOSEPH MAIQKEL, OF BUTTE, MONTANA swamam roa annasxvn wiIEELs,

f gian ss fled meme; 22, me. Serial No. 149,921.

invention relates to improvements in dressing devices for abrasive wheels by brought 'to-a. predetermined form.

-which the peripheries of: the wheels are 5 Ithas'lon vbeeirkn own-tocut away or dress'the peripheriesof abrasive wheels to desired shapes for therewith grinding articlesi'to' given contours. It has further been proposed to mechanically support the tool employed for suchdressin and to guide lt along agiven'p'athby mec anical means.

Thepresent invention proposes certain simplifications in such apparatus, and presents a structure which enables the dressing of wheels rapidly and accurately to any desired profile, and to given diameters.

Another object of the invention is to "so construct the parts that the desired rofile may be given to a sim le cam, w ich no thereafter may be employe repeatedly in the machine to produce abrasive wheels of the desired form. p

A further object of the invention to rovide a structurewhich may be employe to :8 dress the surfaces of 'a number of wheels at a single chucking.

. Further objects are to provide lubricating and scavenging devices for assisting the o eration of the dressing tool; to 'provi e means for readily and easily calibrating the device to dress wheels to a given diameter; to provide means for quickly and easily removin the tool and its associated from the vicinity of the wheel; to provide a. resilient structure to maintain the tool in its cutting position while operating; and

others as will appear inthe course of the following specification and claims. In the drawings:

splined'relation thereon, the collars 13 which support and space the abrasive wheels A, A,

'or any number ma arts Fig. 1 is a plan view of the device in ophere two in number although obviously one 7 be employed. The frame 10 also carries arings 14 supportin the horizontal rock shaft 15 which has keye thereto the rock arms 16. The tool slide includes a base having side plates 20 at the en 5. Cap screws 18 with beads 19 pass-through the plates 20 and are threaded into the base plate 17 It is referred to pass these cap screws 18 throug the free ends of the rock arms 16, so that when the screws are drawn tight, the base plate 17 is located in invariable relation to the arms 16: which relation usually will be to brin the'baseplate 17 and its tool into a radi position with regard to the mandrel 12 T e side plates-20 extend upwardly to present a 'firm support for the cover 21 which is fastened to them by the plate 17. a

A tool carriage 23 may move along the slide between the base plate 17 and cover 21, and is'guided for rectilinear movement by the ribs 24. which engage in correspondin groovesof the plate 17 (Fig. 4). A fee screw 25 is journalled an the walls 20, and has its larger threaded central portion engaged in t e carriage 28, so that by rotation of the screw 25, the carriage is caused to move along the base late 17 in a direction parallel to the man rel 12. One end 26 of the screw projects to a point clear of the adjacent nut 19, and has at its end a hand wheel or crank 27 so that it may be rotated manually in the illustrated form.

late 17 A tool carrier 28 is received for sliding I movement to and from the wheels in the I carriage, and has its front or wheel end en'- larged and constructed as 'a'tool holder to receive the spindle 29 which supports the tool 30 proper, which may be the usual diamond or other dressing instrument; A set screw 31 holds the spindle immovable'with regard to the holder. Beneath the rear end of the tool carrier is fastened a lug 32 which has a pointed forward and (Fig. 2).

The cam 33 has its rear edge formed to the shape predetermined to produce the de on one stud 18.

sired contour on the abrasive wheel. In the illustrated form, since there are two abrasive wheels A, A, designed to have a central ridge with conical slopes therefrom, two projections 34 are formed with central points and straight sides. These points are naturally spaced apart a distance equal to the distance of the ridges on the two abrasive wheels A, A, This cam is secured to the rear of the base plate 17 by the screws 35-: it will be understood that such ,cams are prepared according to the particular contours to be given to the abrasive wheel or wheels, and that it is only necessary to exchange one cam for another to change the machine for dressing wheels to different contours, other conditions being alike.

One bearing 11 is formed with a projecting bifurcated lug 36 which receives a threaded adjusting link 37, which at one end has an eye 38 received loosely for pivotal movement on a spacing collar 39 located The adjusting nuts 40 on the link 37 permit an exact adjustment of the distance between the centers of mandrel 12 and the studs 18. One nut may slightly loosened, and the link 37 swung out of the lug 36, whereupon the entire device may be rocked about the axis of shaft 15, and withdrawn from the abrasive wheels.

In order to force the tool 30 towards the wheels, a leaf spring 41 has its rebent end 42 held rigidly upon the upper surface of the tool carriage 23 by the set screw 43 and clamping collar 44. This leaf spring 41 is bent into a U-shape, and at its free end 42 presses against the rear end of the tool carrier 28 to force it forwardly toward the abrasive wheels. A threaded spindle 45 is attached to the carriage 23, preferably by being formed integrally with the collar 44, and extends rearwardly and through an opening in the spring 41. A nut 46 and washer 47 are engaged on this spindle, and

compress a coil spring 48 which surrounds the latter, with regard to the leaf spring 41, as shown in Fig. 4, to afford a quick snubber or dam ener against harmonic vibrations of the lea spring which may cause scoring of the wheels.

The spring 41, resiliently forces the point 32 toward engagement with the cam 33, no matter what the contour may. be; Depending upon the dressing to be done, the tool cuts its way into the abrasive wheel until 'the point 32 comes into contact with the cam-usually merely a truing is to be .accomplished, for which only a slight amount of material need be removed.

In order to keep the tool 32 clear, a lubricating or scavenging material, such as oil 3 or a solution is delivered from a suitable comprising a rotatable-mandrel to receive the wheels, 2. base plate, means 'to hold said base plate rigid at a predetermined distance from said mandrel, a tool holder and a tool therein movable along said plate pn alle l to.

said mandrel, a leaf spring to move'said holder toward saidmandrel, a coi1.springto assist said leaf spring, and .a rod toguide said leaf spring said coil spring. I V

2. A dressing device for abrasivewvheelS comprising a frame, a mandrel journalled on said frame and receivingthe wheels to be therewith toward andv from said mandrel, a carriage guided on said plate for move.- ment parallel to said mandrel, a tool holder and a tool therein slidable in a plane at right angles to said mandrel, a feed screw.

a forming armth-fe y .90 dressed, a rock shaft journalled on frame, rock arms splined to said shaft a base plate carried by saidarms and movable journalled on said plate to move said car-f riage along said plate, a leaf spring fastened to said carriage and pressing said holder and tool toward said mandrel, a guide rod on saidcarriage to guide the free end of said leaf spring, a coil spring on said guide rod to assist said leaf spring, and acam on said.

plate to limit the movement of said holder.v

3. A dressing device for abrasive wheels comprising a frame havlng a ournal bearing, a mandrel in said bearing'to receive the wheels, rock arms journaled on said frame upon an axis parallel to said mandrel and at a fixed distance'therefrom, a base plate, a collar, cap screws passing through said rock arms and collar and threaded into said base plate to hold the same in fixed relation thereto, a link pivoted on said collar and attached to said frame to maintain said base plate in spaced relation to said mandrel,

and a tool holder and a tool therein movable along said base plate parallel to said manrel.

4. A dressing device for abrasive wheels comprising a frame having a journal bearing, a mandrel in said bearing'to receive the wheels, rock arms journaled on said frame upon an axis paralled to said mandrel and at a fixed distance therefrom, a base plate, side plates at the ends of said base plate, a collar, cap screws passing through said side plates, rock arms and collarand threaded into said baseplate to hold the same in fixed relation thereto, a link pivoted on said collar and attachedto said frame to maintainsaid base plate in spacedrelation to said mandrel, a tool holder and a tool therein movable along said base plate parallel to said mandrel, and a feed screw journaledFi-nlfsaid side plates to move said tool holder and tool.

5. A dressing device for abrasive wheels comprising a rotatable mandrel to receive the abrasive wheel, 'afr-base plate movable to and from said mandrel, means to maintain ,said plate at a predetermined distance from said-mandrel, a-tool carriage mounted on said plate, means to cause said carriage to travel along said plate parallel to said mandrel, a cam on said plate shaped in correspondence with the peripheral contour to be given said wheel, a tool holder slidable on said carriage to and from the mandrel and a tool therein, means on said tool holder to engage said cam and cooperate therewith so that'a movement of said tool toward the axis of said mandrel is limited thereby, aspring blade carried bysaid carriage and rebent for resiliency and to engage said tool holder to move the said tool toward the axis of said mandrel, a spindle attached to the carriage and' passing through an aperture in said spring blade, and a coil spring on said spindle and maintained thereby for engagement with said spring blade to cooperate therewith in maintaining said tool in the operating position.

In testimony whereof, I afiix my signature.

JOSEPH MAICKEL. 

